JPH0343474B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an oil supply mechanism for a hermetic compressor.

[Prior Art] Generally, a hermetic compressor has an oil reservoir section below the mechanical section and the electric section, and the amount of oil is adjusted and sealed so that the oil level reaches the mechanical section. To supply oil to the mechanical parts, attach an oil supply piece to the tip of a hollow drive shaft that has a hole formed approximately concentrically with the shaft center, and insert the oil supply piece into the drive shaft so that the oil flows through the hole formed approximately concentrically with the shaft center. This is done by locking a pump such as a twist plate on the inner diameter.

However, in the oil supply structure using this method, when the oil level that previously reached the mechanical part drops below the tip of the drive shaft, such as when starting the compressor, the centrifugal pump cannot be used with only the cylindrical oil supply piece. Since no action is produced, there is a problem in that lubrication is insufficient and there is a possibility that wear and jamming of mechanical parts may occur.

[Purpose of the invention]

The present invention provides an oil supply mechanism for solving the above-mentioned problems.

[Summary of the invention]

In order to achieve the above object, the present invention includes a drive shaft having a hole formed substantially concentrically with the shaft center, a cylindrical oil supply piece that is latched to the tip of the drive shaft and exists in lubricating oil; and a twist plate that is locked in the hole of the drive shaft and located from the locking part to the tip in the oil supply piece, and the twist plate has a twist part and a non-twist part, and the twist plate has a twist part and a non-twist part, and the twist plate has a twist part and a non-twist part. The oil supply mechanism for a hermetic compressor has a twisted portion at the tip of the oil supply piece.

[Embodiments of the invention]

The explanation will be given below according to the drawings.

FIG. 1 is a diagram showing a conventional oil supply mechanism, which includes a drive shaft 1 having a hole formed approximately concentrically with the shaft center, a twist plate 2 locked in the hole of the drive shaft 1, and a twist plate 2 that is fixed in the hole of the drive shaft 1. A cylindrical oil supply piece 3 that is locked at the tip of the drive shaft 1 below the locking position constitutes a oil supply mechanism. When the oil level that previously reached the mechanical part suddenly drops to the position of the oil supply piece 3 below the tip of the drive shaft 1, such as when starting a compressor, the cylindrical shape If only the lubricating piece 3 is used, the lubricating oil present in the lubricating piece 3 will run idle and no centrifugal pump action will occur, resulting in insufficient lubricating 4 to the mechanical parts (not shown), resulting in wear and jamming of the mechanical parts. It is clear that the occurrence of In contrast, in an embodiment of the present invention shown in FIG. 2, the twist plate 2' is locked in the hole of the drive shaft 1', and the tip of the twist plate 2' is It exists at the tip of the cylindrical oil supply piece 3' which is locked at the tip. Therefore, the twist plate 2' and the oil supply piece 3', which are locked to the drive shaft 1', are integrated with the drive shaft 1' and rotate together with the drive shaft 1'. According to such an embodiment:
Even if the oil level 4 of the lubricating oil drops below the tip of the drive shaft 1', the lubricating oil is kept low because the twist plate 2' is located at the tip of the oil supply piece 3' and rotates together with the oil supply piece 3'. can be prevented from spinning idly within the oil supply piece 3'. Since the lubricating oil is thus prevented from idling within the oil supply piece 3', a centrifugal pump action is produced. Due to this centrifugal pump action, even if the oil level 4 of the lubricating oil drops below the tip of the drive shaft 1', the lubricating oil can be pumped up and the mechanical parts can be sufficiently lubricated.

In addition, the twist plate of the embodiment shown in FIG. 2 has a twisted part with a twisted shape and a non-twisted part with an untwisted shape, and this non-twisted part is located in the tip of the oil supply piece 3'. It's included. As a result, according to these requirements, even if the oil level that previously reached the machine part drops below the tip of the drive shaft, such as when starting up the compressor, the non-twisted portion of the twist plate 2' The lubricating oil in the lubricating piece 3' is prevented from running idle by the lubricating piece 3', and a centrifugal pump action is produced, and the lubricating oil is smoothly pumped up by this centrifugal pumping action, and the lubricating oil is pumped up smoothly. By smoothly and reliably frying the lubricating oil along the inclined surface of the twisted portion, the mechanical parts can be sufficiently lubricated. Moreover,
There is a non-twisted part of the twist plate 2' at the tip inside the oil supply piece 3', and the lubricating oil is pumped up by the centrifugal pump action between this non-twisted part and the oil supply piece 3'. Therefore, compared to the case where the inclined surface of the twisted part directly scrapes up the oil in addition to the centrifugal pump action, the lubricating oil is not pumped up excessively and the flow rate of the lubricating oil is slow by the amount of not scraping up. In addition, the depressurization of the lubricating oil near the opening at the tip of the oil supply piece 3' is suppressed to a small level, reducing the difference in pressure distribution, and the degree of stirring of the lubricating oil caused by the difference in pressure distribution is reduced. This reduces the possibility that the refrigerant dissolved in the lubricating oil will foam. Therefore, since there is no excessive pumping up, a large amount of lubricating oil is not discharged outside the compressor, and there is no possibility that the lubricating oil in the compressor will become insufficient.
Furthermore, since foamed lubricating oil is not supplied, lubrication performance does not deteriorate. In other words, it is possible to provide an oil supply mechanism for a hermetic compressor that realizes sufficient oil supply to mechanical parts. Furthermore, if the distance A between the tip of the twist plate 2' and the oil supply piece 3' is set to 1/2 or less of the inner diameter d of the oil supply piece 3', the oil supply conditions will be even better and reliability will be improved.

〔Effect of the invention〕

As described above, the present invention is capable of stably supplying sufficient oil to mechanical parts, especially when the oil level is low.

[Brief explanation of drawings]

Figure 1 is a partial sectional view showing a conventional embodiment, Figure 2 is a partial sectional view showing a conventional embodiment;
The figure is a partial sectional view showing one embodiment of the present invention. 1, 1'... Drive shaft, 2, 2'... Twist plate, 3,
3'...Oil supply piece, 4...Oil level.

Claims (1)

[Scope of Claims] 1. A hollow drive shaft having a hole formed substantially concentrically with the shaft center, a cylindrical oil supply piece that is latched to the tip of the drive shaft and exists in lubricating oil; and a twist plate that is locked in the drive shaft and located up to the tip inside the oil supply piece, and the twist plate has a twist part and a non-twist part, and the non-twist part is the tip inside the oil supply piece. A lubricating mechanism for a hermetic compressor, wherein the lubricating piece is opened at its tip surface, and the diameter of this opening is smaller than the inner diameter of the portion of the lubricating piece where the non-twisted part is present. .